THE SPIDER CBABS OF AMERICA 217 



ROCHINIA CORNUTA (Rathbun) 



Plate 227, fig. 2 



Anamathia cornuta Rathbun, Proc. U. S. Nat. Mus., vol. 21, 1898, p. 571, 

 pi. 41, fig. 2 (type-locality, northeast of Indefatigable Island, Galapagos 

 Islands, 392 fathoms; holotype, Cat. No. 21572, U.S.N. M.). 



Scyramathia cornuta Rathbun, Mem. Mus. Comp. Zool., vol. 35, 1907, p. 73. 



Diagnosis. — Median tubercles 3; gastric tubercles 3; dorsal pro- 

 tuberances 9, short, conical; rostrum longer than remainder of cara- 

 pace; 2 long marginal spines (paired). 



Description. — Surface closely covered with tuberculiform, cuta- 

 neous vesicles, among which are a few curved hairs. Tubercles and 

 spines of carapace as follows : Gastric region with 3 tubercles or short 

 spines, the lateral ones in advance of the median; cardiac and intes- 

 tinal regions each with one, short and conical; branchial region with 

 2, short, the posterior one the smaller and nearer the median line; 

 hepatic and branchial regions each with a long, slender, marginal 

 spine directed outward, upward and forward. Rostral horns very 

 long, slender, nearh^ equaling or exceeding half the entire length of 

 the carapace, and extending nearly to base of rostrum, widely diver- 

 gent, slightly arched. Supraocular eave well developed, preocular 

 spine slender, not reaching line of base of rostral horns. Basal 

 article of antenna with a short tooth or spine at antero-lateral angle. 

 Pterygostomian ridge with three or four tubercles. A broadly rounded 

 lamina at angle of buccal cavity. 



Chelipeds slender. Merus triangulate; outer face with a low blunt 

 ridge; upper margin with a sharp terminal spine, and a broad sub- 

 acute tooth near proximal end. Carpus with a superior uneven 

 crest, a tubercle on outer surface near distal end. Propodus com- 

 pressed, upper edge thin; dactylus more than half superior length of 

 propodus. Fingers with narrow gape along their basal third, pre- 

 hensile edges crenate. Merus of ambulatory legs with a short spine 

 which decreases in size and acuteness from first to fourth pair, where 

 it is a blunt lobiform prominence. 



Measurements. — Ovigerous female, type, length from posterior 

 margin to tip of horns 50.2, length from base of horns 25, length of 

 horns 26.5, width exclusive of spines 20.2, length of branchial spine 

 9 mm. 



Range. — OS the Galapagos Islands, 392 to 633 fathoms. 



Material examined. — Northeast of Indefatigable Island; lat. 00° 

 29' 00" S.; long. 89° 54' 30" W.; 392 fathoms; wh. bk. S.; 43.9° F.; 

 April 15, 1888; station 2818, Albatross; 5 males, 2 females (1 oviger- 

 ous, holotype) (21572). 



Off Hood Island; lat. 1° 35' 00" S.; long. 89° 30' 00" W.; 633 

 fathoms; It. gy. glob. Oz.; temp. 39.5° F.; November 7, 1904; station 

 4641, Albatross; 1 male (33395). 



